{"id":"F2006B07216","name":"AD/SWSA226/73 Amdt 1 - Current Limiter Protection","slug":"ad-swsa226-73-amdt-1-current-limiter-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48994,"registerId":"commonwealth-F2006B07216-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SWSA226/73 Amdt 1 - Current Limiter Protection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nFairchild (Swearingen) SA226 and SA227 Series Aeroplanes\n\nAD/SWSA226/73\n\nAmdt 1\n\n  \nCurrent Limiter Protection 7/96\n\nApplicability: This Directive is applicable to the following aircraft models equipped with a direct current generator:\n\nModel Serial Numbers\n\nSA226-T, SA226-AT, SA226-TC and SA226-T(B)\n\nSA227-AC, SA227-AT, SA227-BC and SA227-TT\n\n  \nAll\n\n420 through 783 and 785 through 789, all inclusive\n\nSA227-CC and SA227-DC 784 and 790 to 883 inclusive\n\nRequirement: Relocate the left hand (LH) and right hand (RH) essential bus current limiters in accordance with the following Fairchild Aircraft Service Bulletins as appropriate:\n\n| Service Bulletin | Date              | Model                                     |\n| ---------------- | ----------------- | ----------------------------------------- |\n| 226-24-034       | 29 September 1994 | SA226 Series                              |\n| 227-24-015 Rev 1 | 23 February 1995  | SA227-AC, SA227-AT, SA227-BC and SA227-TT |\n| CC7-24-002       | 29 September 1994 | SA227-CC and SA227-DC                     |\n\nNote: FAA AD 95-17-09R1 Amdt 39-9550 refers.\n\nCompliance: The compliance remains unchanged as ‘Within 2,000 hours time in service after 9 November 1995’. This amendment is effective from 30 June 1996.\n\nBackground: Action required by this Directive is designed to eliminate the possibility of a failure of the current limiter in combination with an engine failure causing loss of power to the essential bus.\n\nThis amendment revises the serial number range for certain SA-227 aeroplanes and corrects the SA-227 model designation.\n\nThe original issue of this Airworthiness Directive became effective on 9 November 1995.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The changes are minor administrative corrections: revising serial number ranges and correcting a model designation. The core safety purpose (preventing loss of essential bus power) remains unchanged from the original 1995 directive."},"complexity_factors":["Single, specific technical requirement (relocate current limiters)","Limited applicability clearly defined by aircraft model and serial number ranges","Only 3 cross-referenced service bulletins and 1 FAA AD reference","No nested conditional logic or exceptions","Straightforward compliance deadline (time-in-service hours)","Short document with minimal defined terms"],"plain_english_summary":"This Airworthiness Directive requires relocation of electrical current limiters on certain Fairchild Swearingen SA226/SA227 aircraft with DC generators to prevent simultaneous current limiter failure and engine loss from cutting essential power. It affects specific serial-numbered aircraft and must be done per the listed service bulletins. Compliance is required within 2,000 flight hours after 9 November 1995."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment adjusts applicability by revising SA227 serial‑number ranges and correcting model designations but leaves the compliance requirement and deadline unchanged. In effect it changes which specific aircraft are covered without altering the mandated corrective action or compliance timing (Background; Applicability; Compliance)."},"complexity_factors":["Multiple models and specific serial‑number ranges require fleet-level identification and record checks (Applicability).","Mandate depends on following several manufacturer service bulletins, so compliance requires obtaining and following external technical instructions (Requirement).","Fixed compliance window expressed as hours TIS with a past effective date — administrators must interpret ongoing enforceability (Compliance).","Amendment modifies serial ranges and model designation, so operators must reconcile previous AD status against the revised applicability (Background).","Cross-reference to FAA AD adds an external regulatory linkage that may affect interpretation or concurrent obligations (Note)."],"plain_english_summary":"This Airworthiness Directive requires relocating the left‑ and right‑hand essential bus current limiters on specified Fairchild (Swearingen) SA226/SA227 aeroplanes using the listed Fairchild service bulletins (Requirement). Compliance must occur within 2,000 hours time in service after 9 November 1995 (Compliance).\n\nStated purpose is to prevent a current‑limiter failure combined with an engine failure from removing power to the essential bus (Background). Owners/operators pay for and carry out the SB work; the regulator fixes affected aircraft by model and serial number (Applicability)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection","history":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection/history","analysis":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection/analysis","conflicts":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection/conflicts","importantCases":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection/important-cases","documents":"/api/acts/ad-swsa226-73-amdt-1-current-limiter-protection/documents"}}